Motors Book - Chapter 2

15 Questions | Total Attempts: 57

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Motors Book Quizzes & Trivia

Questions and Answers
  • 1. 
    A(n) ___ is a metal tag permanently attached to an electric motor frame that gives the required electrical ratings, operating rating, and mechanical-design codes of the motor.
    • A. 

      Nameplate

    • B. 

      Insulation class

    • C. 

      Identification tag

    • D. 

      Motor label

  • 2. 
    Electrical ratings included on motor nameplates include a ___ rating and phase.
    • A. 

      Current

    • B. 

      Frequency

    • C. 

      Voltage

    • D. 

      All of the above

  • 3. 
    The ___ rating is the amount of current a motor draws when delivering full rated power output.
    • A. 

      Frequency

    • B. 

      Voltage

    • C. 

      Current

    • D. 

      Flux

  • 4. 
    ___ current, or starting current, or inrush current, is the amount of current a motor draws on startup or when the rotor is locked.
    • A. 

      Unlocked-rotor

    • B. 

      Locked-rotor

    • C. 

      Wound-rotor motor

    • D. 

      Eddy

  • 5. 
    The ___ rating is a description of the expected or allowed application of a motor.
    • A. 

      Service factor

    • B. 

      Speed

    • C. 

      Power

    • D. 

      Usage

  • 6. 
    The ___ is the difference between the winding temperature of a running motor and the ambient temperature.
    • A. 

      Ambient temperature rating

    • B. 

      Permissible temperature rating

    • C. 

      Temperature rise

    • D. 

      Permissible temperature rise

  • 7. 
    ___ motors are used in applications such as compressors, waste-disposal systems, electric hoists, gate opening motors, and other applications in which the motor need only be turned on for short time periods to meet the application requirements.
    • A. 

      Intermittent-rated

    • B. 

      Continuous-duty

    • C. 

      Locked-rotor torque

    • D. 

      High-inertia

  • 8. 
    The NEMA ___ letter is a code letter representing a National Electrical Manufacturers Association (NEMA) motor classification for the torque and current curves of a motor.
    • A. 

      Identification

    • B. 

      Insulation class

    • C. 

      Design

    • D. 

      None of the above

  • 9. 
    A design ___ motor is an integral-horsepower 3-phase induction motor design mode for full-voltage starting and high locked-rotor torque, with locked-rotor current not exceeding a specified value.
    • A. 

      B

    • B. 

      C

    • C. 

      E

    • D. 

      F

  • 10. 
    A ___ is a machine component used to reduce friction and maintain clearance between stationary and moving parts.
    • A. 

      Motor shaft

    • B. 

      Motor bearing

    • C. 

      Plug fuse

    • D. 

      Bimetallic-strip overload relay

  • 11. 
    The ___ is a code letter signifying the maximum operating temperature of the insulation used in a motor.
    • A. 

      Insulation class

    • B. 

      Design letter

    • C. 

      Frame size

    • D. 

      Motor rating

  • 12. 
    A design ___ motor is an integral-horsepower single-phase motor design made for full-voltage starting and locked-rotor torque higher than for design M, N, and O motor
    • A. 

      H

    • B. 

      J

    • C. 

      K

    • D. 

      L

  • 13. 
    The ___, or duty cycle, is the amount of time a motor can be operated without being turned OFF to allow for cooling.
    • A. 

      Running time

    • B. 

      Operating time rating

    • C. 

      Operating cycle

    • D. 

      Rotor rating

  • 14. 
    ___ type is the type of protection given to a motor to shield the motor from the outside environment as well as to protect individuals from the electrical and rotating parts of the motor.
    • A. 

      Enclosure

    • B. 

      Design

    • C. 

      Shield

    • D. 

      None of the above

  • 15. 
    ___ motor enclosures include general, dripproof, splashproof, guarded, semiguarded, and dripproof fully guarded types.
    • A. 

      Enclosed

    • B. 

      Reactive

    • C. 

      Open

    • D. 

      Stator

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